CN100373988C - Method for carrying out multicast in mobile communication system - Google Patents
Method for carrying out multicast in mobile communication system Download PDFInfo
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- CN100373988C CN100373988C CNB2004100667632A CN200410066763A CN100373988C CN 100373988 C CN100373988 C CN 100373988C CN B2004100667632 A CNB2004100667632 A CN B2004100667632A CN 200410066763 A CN200410066763 A CN 200410066763A CN 100373988 C CN100373988 C CN 100373988C
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Abstract
The present invention relates to a mobile communication system which discloses a method for carrying out multicast in the mobile communication system, which makes the application of MBMS service more flexible and makes wireless resources furthest used. In the method for carrying out multicast in the mobile communication system, the desired emission power of the multicast service is obtained from the parameter calculation of BSC/RNC according to the default user coverage rate or the coverage rate of start request of the multicast service. Coverage rate parameters can be the user coverage rate or the area coverage rate, can be generated from the BM-SC, and can be used as signing contract data. When used, the user coverage rate can be firstly converted into area coverage rate according to current user distributing situation, and then transmission power is in calculation.
Description
Technical field
The present invention relates to mobile communication system, particularly the data transmission technology in the mobile communication system.
Background technology
In communication system, multicast (Multicast) and broadcasting (Broadcast) are a kind of technology that transmits data from a data source to a plurality of targets.For example, in Ethernet, Internet Group Management Protocol (Internet Group Management Protocol is called for short " IGMP ") is exactly internetworking protocol (Internet Protocol is called for short " the IP ") multicasting technology that is used for multicast.
Along with the development of mobile communication, multicast and broadcasting also more and more are applied among the mobile network.For example, in traditional mobile network, cell broadcaste service (Cell Broadcast Service is called for short " CBS ") allows low bit rate data to share broadcast channel to all users' transmissions by the sub-district, and this broadcasting service belongs to information series business.
Now, the development of mobile communication makes the user no longer be satisfied with phone and messaging service to the demand of mobile communication, fast development along with internet (Internet), a large amount of multimedia services emerge, the some of them applied business requires a plurality of users can receive identical data simultaneously, as video request program, television broadcasting, video conference, online education, interactive game etc.These mobile multi-media services are compared with general data, have characteristics such as data volume is big, longer duration, delay sensitive.Present IP multicasting technology can the form with multicast or broadcasting be realized these multimedia services on wired IP network, but because the mobile network has particular network structure, functional entity and wave point, these are all different with wired IP network, and therefore this technology is not suitable for the mobile network.
In order to address the above problem, effectively utilize mobile network resource, Wideband Code Division Multiple Access (WCDMA) (WidebandCode Division Multiple Access, be called for short " WCDMA ")/global system for mobile communications (GlobalSystemfor mobile Communication, abbreviation " GSM ") global standardsization are organized third generation partner program (3rd Generation Partnership Project, abbreviation " 3GPP ") multimedia broadcasting and multicast service (Multimedia Broadcast/Multicast Service have been proposed, be called for short " MBMS "), in the mobile network, provide a data source to send the business of data to a plurality of users, the realization Internet resources are shared, improve utilization rate of network resource, the interface resource of especially eating dishes without rice or wine.The MBMS of 3GPP definition can not only realize the classes of messages multicast and the broadcasting of plain text low rate, and can also realize the multicast and the broadcasting of high-speed multimedia business, and this has complied with the trend of following mobile data development undoubtedly.
The defined MBMS architecture of 3GPP as shown in Figure 1.
Wherein, broadcast multicast service center (Broadcast Multicast Service Center, be called for short " BM-SC ") be mobile network functional entity in order to support that MBMS is professional and newly-increased, it is the inlet of content supplier, be used for authorizing and initiating the MBMS bearer service, and plan transmits the MBMS content to schedule at mobile network.In addition, subscriber equipment (User Equipment, be called for short " UE "), universal mobile telecommunications system grounding wireless access network (UMTS Terrestrial Radio Access Network, be called for short " UTRAN "), the enhancing data wireless access network of global system for mobile communications and evolution thereof (GSM EDGE Radio Access Network, be called for short " GERAN "), GPRS serving GPRS support node (Serving GPRS Support Node, be called for short " SGSN "), gateway GPRS supporting node (GGSN) (GPRS Gateway Support Node, be called for short " GGSN ") wait functional entity to strengthen, increased the function that MBMS is correlated with.
MBMS comprises multicast pattern and broadcast mode.Because it is different that multicast and broadcast mode exist, cause also difference of its operation flow on business demand.
The operation flow of MBMS multicast pattern as shown in Figure 2.
Under the MBMS multicast pattern, the user adds the MBMS multicast service by MBMS activation, and which user makes network know has wish to receive some specific MBMS business.Network node is by the MBMS registration process, foundation is from BM-SC, through GGSN, SGSN is to base station controller (BaseStation Controller, be called for short " BSC ")/radio network controller (Radio Network Controller, abbreviation " RNC ") distribution tree, thus allow MBMS transmission session attribute and data.Registration process has been set up the MBMS bearer context at interdependent node.When BM-SC is ready to send data, trigger the MBMS session and begin process.The session process that begins activates in the network and is used for the bearing resource of all needs of MBMS transmission data, and notifies interested UE to be about to begin transfer of data.By this process, BM-SC with the service quality of MBMS (Quality of Service is called for short " QoS "), MBMS business domains, estimate that session attribute such as length of session parameter offers interested relevant network node.By this process, can cause relevant RNC and carry out conversation informing at Access Network, the community user counting, radio bearer type is selected, work such as wireless and wired load plane foundation.BM-SC etc. flow after node finishes relevant work to the downstream, the beginning muticast data transmission.The carrying multicast data transmission that each node begins to set up in the process by session is up to UE.
The operation flow of MBMS broadcast mode as shown in Figure 3.
Under the MBMS broadcast mode, because broadcasting service all users in wireless network send information, so each network node does not need to carry out the MBMS registration process.When BM-SC is ready to send data, trigger the MBMS session and begin process.Session begins process and activates the bearing resource that is used for all needs of MBMS transmission data in the network.By this process, BM-SC offers interested relevant network node with terminal mobile group designation (Terminal Mobile Group Identify is called for short " TMGI "), QoS, MBMS business domains, the estimation length of session parameter session attributes such as (if present) of this MBMS bearer service.By this process, work such as wireless and wired load plane foundation.BM-SC etc. flow after node finishes relevant work to the downstream, the transfer of data of going on the air.The carrying transmission broadcast data that each node begins to set up in the process by session is up to UE.
Those of ordinary skill in the art as can be seen, the main business workflow of MBMS broadcast mode and multicast pattern is more similar, needs all to carry out successively that service statement, session begin, MBMS notifies, data transmit and the processing of conversation end; The difference of the two is, multicast pattern also needs user's corresponding multicast group of contracting, and carries out activation of service, and produces corresponding charge information according to the moment that the user adds and the user withdraws from.
The initial successful flow process of MBMS on the Iu interface of the existing method that multicast service is provided in the 3GPP network as shown in Figure 4.
The SGSN module 20 of core net (Core Network is called for short " CN ") side sends the MBMS session and begins request (MBMS Session Start Request) message, gives each BSC/RNC module 10 that links to each other with this SGSN module 20.Wherein, MBMS Session Start Request message comprises session attribute and MBMS service identification.After BSC/RNC module 10 was received, the responding MBMS session began response (MBMS Session Start Response) message and gives SGSN module 20.Need to prove the function that the initial flow process of MBMS also provides the Iu interface data carrying of MBMS to set up.If BSC/RNC module 10 can not provide required resource, then BSC/RNC module 10 will be notified SGSN module 20.If BSC/RNC module 10 is in the MBMS business domains, it is in the MBMS business contexts, preserve session attribute, the status attribute that the MBMS business contexts is set is " activation ", the responding MBMS session begins response message, RNC comprises tunnel endpoint identifier (Tunnel EndpointIdentifier is called for short " TEID ") to begin in the response message in the MBMS session, is used for the Iu load plane that this SGSN is used to send the MBMS data.RNC has received a plurality of MBMS sessions and has begun request message, carries Iu load plane parameter in the message, only returns a MBMS session and begins response message, is used to set up the Iu planes carry that arrives SGSN module 20.
Wherein, specifying of MBMS about the 3GPP definition can be referring to " Introduction oftheMultimedia Broadcast Multicast Service (MBMS) in the Radio Access Network (RAN) " (3GPP TS 25.346), and Chinese can be translated into " the online multimedia broadcast multi-broadcasting business of wireless access " (third generation partner program technical standard 25.346); And " S-CCPCH performancefor MBMS " (3GPP TS 25.803), Chinese can be translated into " the auxiliary publish control physical channel working condition of supporting multimedia broadcast multi-broadcasting business " (third generation partner program technical standard 25.803).
When adopting MBMS that multicast service is provided, the power requirement of different coverages can be referring to the simulation result of Fig. 5.Wherein, abscissa is the ratio of the power output and the base station peak power output of MBMS business, ordinate is the coverage that the ratio of the total area coverage of area coverage and base station of MBMS is represented, the curve of coverage when three curves are respectively and with the power output of different MBMS business the vehicle with the pedestrian of the vehicle of 30Km/h motion, 3Km/h motion and 3Km/h motion are covered.As can be seen, when adopting higher coverage to cover, to the requirement of base station power output than higher.
Yet within total area coverage of base station, traffic carrying capacity and user's distribution is also inhomogeneous, and is especially true under networking initial stage and macrocell (Macrocell) situation, and user's major part of traffic carrying capacity and most worthy all concentrates near the zone the base station.May comprise 80% user in 20% the scope near the base station.
In the existing technical scheme, when the MBMS initial session begins, quality of service index, for example Service Data Unit (Service Data Unit, being called for short " SDU ") Block Error Rate (Block Error Rate is called for short " BLER ") etc. provides in MBMS Session Start Request message.And coverage is fixed, and is determined by operator, generally gets the higher index of 90%, 95% geometric ratio.BSC/RNC can be the necessary Radio Resource of transmission foundation of MBMS data according to quality of service index and coverage parameter.
In the prior art scheme, the foundation of Radio Resource is prerequisite to satisfy certain covering with certain operation quality requirement in the system, just have only when the Radio Resource of a sub-district can guarantee that current sessions can provide with certain quality in certain coverage and just set up, otherwise do not set up Radio Resource, just can't provide professional yet.
Consider within total area coverage of base station, traffic carrying capacity and user's distribution is also inhomogeneous, even under traffic carrying capacity and the relatively more uniform situation of user distribution, high coverage is not that all are professional necessary yet, for example: the broadcasting service of advertisement character, can come to collect different expenses according to the scope that in the sub-district, covers, so BSC/RNC be necessary the target coverage scope that the requirement according to business decides the base station to reach to content supplier.
In actual applications, there is following problem in such scheme: the application of MBMS business is dumb in the existing mobile communication system, when needs are set up the MBMS business, BSC/RNC or setting up Radio Resource in a big coverage provides professional, can not set up Radio Resource, can't provide professional, also cause waste of radio resources simultaneously.
Cause the main cause of this situation to be, in the prior art, coverage is determined by operator, is a fixing higher coverage rate, and so high coverage rate is often also inessential; Because it is higher to the power requirement of base station to reach large-scale covering, when the total descending interference level of sub-district under the condition with higher, can cause total descending interference to surpass thresholding if set up the Radio Resource of MBMS business again, just can't set up the Radio Resource of MBMS business in this case, can not provide the MBMS business, the waste of radio resources that has also caused these not make full use of.
Summary of the invention
In view of this, main purpose of the present invention is the method for carrying out multicast in a kind of mobile communication system is provided, and makes that the application of MBMS business is more flexible, and Radio Resource is utilized.
For achieving the above object, the invention provides the method for carrying out multicast in a kind of mobile communication system, comprise following steps:
Base station control device receiving multicast traffic in the described mobile communication system of A begins request;
Coverage rate parameter during B begins to ask according to the operation quality requirement of the operation quality requirement of this multicast service and predefined user coverage rate or this multicast service and described multicast service is calculated the needed transmitting power of described multicast service;
C judges whether described base station control device can provide the described transmitting power that calculates, if then for described multicast service Resources allocation provides this multicast service, otherwise refuse this multicast service.
Wherein, described step B also comprises following substep:
According to active user's distribution situation described predefined user coverage rate is converted to area coverage;
According to the described area coverage that calculates, calculate the needed transmitting power of described multicast service.
Coverage rate parameter during described multicast service begins to ask is an area coverage.
Coverage rate parameter during described multicast service begins to ask is a user coverage rate, and,
Described step B also comprises following substep:
User coverage rate in according to active user's distribution situation described multicast service being begun to ask is converted to area coverage;
According to the described area coverage that calculates, calculate the needed transmitting power of described multicast service.
Coverage rate parameter during described multicast service begins to ask can be produced by the broadcast multicast service center in the described mobile communication system.
Described coverage rate parameter determines when signatory with interior perhaps service provider in operator, as to one of service provider's foundation of chargeing perhaps in this.
Described base station control device is base station controller or radio network controller.
Described mobile communication system is any one in enhancing data system, broadband CDMA system and the TDS-CDMA system of General Packet Radio Service System, global system for mobile communications evolution.
By relatively can finding, technical scheme difference with the prior art of the present invention is, the needed transmitting power of multicast service is that the coverage rate calculation of parameter in being begun to ask according to default subscribers coverage rate or multicast service by BSC/RNC obtains.The coverage rate parameter can be user coverage rate or area coverage, can be used as subscription data and is produced by BM-SC.When using user coverage rate, can be converted into area coverage earlier, and then calculate transmitting power according to active user's distribution situation.
Difference on this technical scheme has brought comparatively significantly beneficial effect, and promptly the transmitting power of determining according to variable coverage parameter is more near user's actual needs, comprise specifically following some:
At first, using the present invention program can provide the MBMS business more flexibly or more MBMS business is provided under same power condition, thereby can when needing to increase operation cost hardly, improve the ability of operator's service to a greater extent, increase the income of operator.
Secondly, use the present invention program and can make full use of Radio Resource more, avoided idle waste of radio resources.
The 3rd, use the present invention program and can make operator satisfy the demand of user and service/content supplier more flexibly with minimum cost, can use the very positive effect of having played for the popularization of MBMS business.
Description of drawings
Fig. 1 is the defined MBMS architecture of 3GPP;
Fig. 2 is the operation flow of MBMS multicast pattern;
Fig. 3 is the operation flow of MBMS broadcast mode;
Fig. 4 is the initial successful flow process of MBMS on the Iu interface of the existing method that multicast service is provided in the 3GPP network;
Fig. 5 is when adopting MBMS that multicast service is provided, the simulation result of the power requirement of different coverages;
Fig. 6 is according to message and handling process between each entity of the method for carrying out multicast in the mobile communication system of a preferred embodiment of the present invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
Basic principle of the present invention at first is described.The present invention program provides in the process in the MBMS business, in order to reach the transmitting power of control base station, improve the purpose of Radio Resource utilization ratio, simultaneously, do not reduce professional quality again and satisfy content supplier/service provider's demand, the coverage rate changeable parameters of MBMS business, the base station can determine distributing radio resource whether and determine the transmitting power of base station according to the coverage rate parameter.By changing the coverage rate parameter control base station transmitting power of MBMS business, just can provide MBMS business more flexibly like this, make full use of Radio Resource simultaneously.
According to the message between each entity of the method for carrying out multicast in the mobile communication system of a preferred embodiment of the present invention and handling process as shown in Figure 6.
At first, BM-SC module 40 is ready for sending before the MBMS data, sends the MBMS session and begins to ask the GGSN module 30 registered to all.Wherein, the MBMS session begins request and comprised session attribute, and session attribute provides the parameter of the sessions such as session persistence of quality of service, MBMS service area, estimation, need to prove, in a preferred embodiment of the present invention, coverage rate is sent simultaneously as session attribute.Wherein, coverage rate shows the minimum coverage rate requirement in a sub-district that this business can be accepted, and determines when this parameter is contracted in same business/content supplier of operator, can be used as the foundation that business/content supplier is chargeed.
Then, session attribute begins request through SGSN module 20 by the MBMS session, sends to BSC/RNC module 10.
At last, whether BSC/RNC module 10 is the transmitting power that this MBMS session distributes wireless access network resource and base station according to the Radio Resource operating position decision of session attribute such as coverage rate, quality of service, MBMS service area and each base station, if be allocated successfully then set up this MBMS session, otherwise that the MBMS session is set up is unsuccessful.Wherein, the transmitting power of base station can be calculated according to coverage rate by BSC/RNC module 10.Need to prove that coverage rate can have multiple different meaning, by prior agreement, coverage rate can be represented area coverage or user coverage rate respectively.
In another preferred embodiment of the present invention, when coverage rate was user coverage rate, BSC/RNC module 10 at first was converted to area coverage according to user's distribution situation with user coverage rate, calculated the transmitting power of base station then according to area coverage.In such cases, BSC/RNC need know the distribution situation of user in each base station scope.The technology that the present mobile subscriber of support locatees is comparative maturity, for example based on cell ID positioning mode, observed time difference-down link idling cycle (OTDOA-IPDL) localization method and property of network auxiliary global positioning system (Global Position System is called for short " GPS ") positioning mode.Therefore network side knows that the distribution situation of user in each base station is fully possible.If the user distribution in the scope of base station is very regular certainly, also can directly use predefined distributed model.Those skilled in the art of the present invention can know, according to user's distribution situation user coverage rate being converted to area coverage is not scabrous mathematical problem, here is not described in detail.
For example, in a preferred embodiment of the present invention, base station only remains 20% power can distribute use, the coverage rate value is represented area coverage, when the coverage rate value is 90%, satisfy the power of the operation quality requirement needs base station 30% of this session simultaneously, then the requirement of current business can not be satisfied in this base station, is not the transmitting power of this session distributing radio resource and base station just; When coverage rate index value is 30%, satisfy the power of the operation quality requirement needs base station 10% of this session simultaneously, in this case, BSC/RNC module 10 is just set up Radio Resource for this session.In another preferred embodiment of the present invention, the same only residue in base station has 20% power can distribute use, the coverage rate value is represented user coverage rate, when the coverage rate value is 90%, area coverage after the conversion is 70%, the quality of service that satisfies this session is simultaneously only required the power output of needs base station 15%, and can set up Radio Resource this moment for this session.
Need to prove that in addition coverage rate can also be used to as one of foundation that content/service provider is chargeed except being used for calculating transmitting power, content/service provider is chargeed according to the size decision of the coverage rate that provides what.
In another preferred embodiment of the present invention, in beginning the session attribute of request message, session do not comprise the coverage rate index, and BSC/RNC uses the user coverage rate requirement of acquiescence.Receive after session begins request message at BSC/RNC, BSC/RNC determines regional coverage according to the distribution situation of user in the base station at that time, and calculate this MBMS session power demand, and determine whether transmission power level in view of the above into this session distributing radio resource and base station according to regional coverage and operation quality requirement etc.
Those of ordinary skill in the art are appreciated that, in various mobile communication system, the principle of setting up multicast is similar, therefore the present invention program goes for multiple mobile communication system, including but not limited to: GPRS (General Packet Radio Service, be called for short " GPRS "), the enhancing data of GSM evolution (Enhanced Data ratefor GSM Evolution, be called for short " EDGE "), WCDMA and TD SDMA (Time Division Synchronous Code DivisionMultiple Access SCDMA is called for short " TD-SCDMA ").
Though by reference some preferred embodiment of the present invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that, can do various changes to it in the form and details, and the spirit and scope of the present invention that do not depart from appended claims and limited.
Claims (8)
1. the method for carrying out multicast in the mobile communication system is characterized in that, comprises following steps:
Base station control device receiving multicast traffic in the described mobile communication system of A begins request;
Coverage rate parameter during B begins to ask according to the operation quality requirement of the operation quality requirement of this multicast service and predefined user coverage rate or this multicast service and described multicast service is calculated the needed transmitting power of described multicast service;
C judges whether described base station control device can provide the described transmitting power that calculates, if then for described multicast service Resources allocation provides this multicast service, otherwise refuse this multicast service.
2. the method for carrying out multicast in the mobile communication system according to claim 1 is characterized in that, described step B also comprises following substep:
According to active user's distribution situation described predefined user coverage rate is converted to area coverage;
According to the described area coverage that calculates, calculate the needed transmitting power of described multicast service.
3. the method for carrying out multicast in the mobile communication system according to claim 1 is characterized in that, the coverage rate parameter during described multicast service begins to ask is an area coverage.
4. the method for carrying out multicast in the mobile communication system according to claim 1 is characterized in that, the coverage rate parameter during described multicast service begins to ask is a user coverage rate, and,
Described step B also comprises following substep:
User coverage rate in according to active user's distribution situation described multicast service being begun to ask is converted to area coverage;
According to the described area coverage that calculates, calculate the needed transmitting power of described multicast service.
5. according to the method for carrying out multicast in claim 3 or the 4 described mobile communication system, it is characterized in that the coverage rate parameter during described multicast service begins to ask can be produced by the broadcast multicast service center in the described mobile communication system.
6. the method for carrying out multicast in the mobile communication system according to claim 5 is characterized in that, described coverage rate parameter determines when signatory with interior perhaps service provider in operator, as to one of service provider's foundation of chargeing perhaps in this.
7. according to the method for carrying out multicast in each described mobile communication system in the claim 1 to 4, it is characterized in that described base station control device is base station controller or radio network controller.
8. according to the method for carrying out multicast in each described mobile communication system in the claim 1 to 4, it is characterized in that described mobile communication system is any one in enhancing data system, broadband CDMA system and the TDS-CDMA system of General Packet Radio Service System, global system for mobile communications evolution.
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| CN100484078C (en) * | 2006-10-13 | 2009-04-29 | 中国移动通信集团公司 | A method to realize VPN multicast |
| CN100547965C (en) * | 2007-06-29 | 2009-10-07 | 中国科学院计算技术研究所 | Multicasting link allocation method in a kind of broadband wireless communication network |
| CN101102550B (en) * | 2007-08-07 | 2011-10-26 | 中兴通讯股份有限公司 | Method for guaranteeing consistent CDR of different GPRS supported nodes in multicast service |
| CN103118338B (en) * | 2011-11-17 | 2018-01-02 | 上海中兴软件有限责任公司 | Trunked communication system method for controlling downlink power and device based on eMBMS |
| CN109792587B (en) * | 2016-09-29 | 2021-02-12 | 华为技术有限公司 | Method and equipment for sending multicast service |
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| US20030157952A1 (en) * | 2002-02-19 | 2003-08-21 | Sinikka Sarkkinen | Adaptive power control for multicast transmission |
| WO2003105367A1 (en) * | 2002-06-07 | 2003-12-18 | Siemens Aktiengesellschaft | Method and system for controlling the transmitting power of group-messages of different groups |
| CN1496161A (en) * | 2002-09-19 | 2004-05-12 | ���ǵ�����ʽ���� | Method for dertermining MBMS business transmission conception in mobile communication system |
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| US20030157952A1 (en) * | 2002-02-19 | 2003-08-21 | Sinikka Sarkkinen | Adaptive power control for multicast transmission |
| WO2003105367A1 (en) * | 2002-06-07 | 2003-12-18 | Siemens Aktiengesellschaft | Method and system for controlling the transmitting power of group-messages of different groups |
| CN1496161A (en) * | 2002-09-19 | 2004-05-12 | ���ǵ�����ʽ���� | Method for dertermining MBMS business transmission conception in mobile communication system |
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